In fact, March 2012's average of 53.5 degrees Fahrenheit blew away the previous record, of 48.6 degrees, set more than 100 years ago. One meteorologist called it "mind-boggling," and said it would still be in Chicago's top 10 warmest months if this had happened in April.

Of course, it wasn't just in Chicago. Across the country, 7,577 daily all-time high temperature records were met or exceeded in March 2012, Bloomberg reported.